Cooling system



Sept. 23, H930, F. G. CARRINGTON COOLING iSYSTEM Original Filed March 9,1927 2 Sheets-Sheet l Sem., 23 E936. F. G. cARRlNGTON 1,776,577

COOLING SYSTEM Original Filed March 9, 1927 2 Sheets-Sheet 2 armament@.Patented Sept 23, 1930 NITEDSTATES PATENT FRANK G. CARRINGTON, 0FANNISTON, ALABAMA, ASSIGNOR T0 I EERRIC\ENGINEERING COMPANY, OFANNISTON, ALABAMA, A CORPORATION OF DELAWARE COOLING SYSTEM .Applicationfiled March 9, 1927, Serial No. 173,903. Renewed August 9, 1930.

1rlhis invention relates to a cooling system, and more part-icularly toa cooling system 1n a centrifugal casting apparatus.

rlhe cooling systemsheretofore employed have taken the form in the pastof either a jacket for a cooling medium surrounding the mold, or amember for sprinklin a cooling 4uid upon the exterior surface o themold.

ln either case, however, there have been certain undesirable results.

The temperature of' any object is determined by its heat conductivity,the degree of heat or cold it is subjected to, and the time it is sosubjected. ln this connection we are chiey concerned with the timefactor. The cooling heretofore has been commenced at the Sametime alongthe entire length of the mold, and, inasmuch as the molten metal ispoured longitudinally, there is a diierence in the molds temperature atdiderent points along its length at the time metal is poured at suchpoints. Assuming that the metal is poured at the bell end first andthetrough gradually movedtrom that end toward the spigot, as is usuallythe case, that portion of the mold at the spigot end has been eX- posedto the cooling action for a greater length ,of time, at the moment themetal is poured there, than has the bell end. The metal therefore ispoured into a cooler portion of the mold at the spigot end than at thebell. This diderence in cooling results in a dierent texture of thepipe, for texture deponds upon the cooling of the molten metal.

This diderential cooling alongthe length ot the mold not only results indefects in thel casted objects, but causes uneven stressesn the molditself. It has been found in practice that the mold fails at the Vspigotend after a relatively few casting operations.

Another defect in those systems heretofore emplo ed has been that thecasting is casechille because of the sudden cooling to which the metalis subjected. This is particularly true at the spigot end. Such a pipeis not commercially usable under ordinary circumstances,l and in orderto render the pipe lit for use, 1t 1s necessary to anneal it. .Anannealing process requires additional time and is a 5o comparativelycostly operation.

falong its length, and thus insuring its longevity, and on the otherhand to cool the metal so gradually that annealing oi' the product willbe obviated. To accomplish this is one of the objects of my invention.

Another object is to devise a method of sectionally cooling a rotarycasting mold.

A further object is to provide a cooling system for sectionally coolinga rota ry casting mold.

Yet another object of this invention is to provide a system whereby amold may be cooled progressivel along its length.

A still further o ject is to provide a cooling system whereby a sectionof a rotary casting mold is cooled and whereby this section advancesalong the len th. of the mold at a predetermined relations ip to thepouring of metal within the mold.

To accomplish the foregoing objects, and other important results, aswill more fully appear herein, my invention consists in a ycoolingmember with means :tor regulating the operative length of said coolingmember, and actuating means therefore adjusted to regulate the coolingat a predetermined relationship to the deposition of molten metal in themold.

Reference is made to the accompanying drawings, in which is shown oneVform in which my invention may be embodied, but itis to be understoodthat many variations may he made in the structure set forth withoutexceeding the extent of my invention.

In the drawings:

Figure l is a sectional view along the longitudinal axis of a mold andcooling system and an elevational view of a ladling device and pouringtrough;

Fig. 2 is a cross sectional view of the device Btl which the plungersprecede the trough in their axial movement along the mold;

Fig. 6 is -a view of the coolingsystm in which the cooling does notcommence until after the metal has been deposited.

Referringin more detail to Fig. 1, there is shown a rotatable mold 1supported upon trunnions 2, which in turn are mounted yon roller boxes 3fixed to the base 4 of the apparatus. The mold is shown with an enlargedend 5 for the formation of a bell, although such^formation is notnecessary `for many pipes are'cast without a bell formation. Lips 6 areprovided to insure the retention of poured metal in the mold when themetal is poured in that portion of the pipe. In the bell end of the pipethere is inserted and held, by suitable means not shown, a head core 7with a shouldered portion 8. This core, together with the vparticularformation 5 of the mold, provides a ing of a pipes bell. The head coremay be withdrawn from the mold at the completion of a. casting operationin order that the cast pipe may be removed. A bearing member 9 I servesto support the mold, and, by means of a guideway 11 therein andacorresponding groove on Ithe circumference of the mold, prevents axialmovement of the mold. The bearing member 9 may be of the split type, orit 4may be provided with a split bushing. Gears 12 on the exterior ofthe mold mesh with other gears, not shown, which provide the drivingforce for the rotation of themold.

Supported above-the mold is a chamber 13 provided with apertures 14. The-member 13 is supported by a standard 15 and also rests within thebearing member 9. While I have shown this chamber positioned .above themold, it may be located. at other points adjacent the mold with suitableprovisions for directin a the mold. Within the member 13 there areslidably positioned the plungers 16 and 17. These plungers formwatertight its with the chamber and prevent the passage offa fluidbeyond thatl portion of the member intermediate them.

While the plungers 16 and 17 may slide within the chamber, they arefxedly spaced with respect to each other by means -of the pipe 18. -fThis pipe is provided with apertures 19 for admitting a fluid into thechamber 13. The ipe`18 extends through the plunger 17 and) serves asaconduit from the source of supply of the cooling medium to the point ofits dispersion. The plunger 17 1s so mounted upon thepipe 18 that thereis no opportunity for a fluid to pass through the plunger except Withinthe pipe.

It will therefore be seen that the chamber 13 can receive a coolingmedium only fromI the apertures 19. The plungers '16 and 17' retain sucha iuid within that portion of the chamber` intermediate them.` and theonly channel for Vthe shapA cooling fluid upon the exterior of method ofescape of the cooling medium is,

trough 25 from the spout 26 of which there /r is discharged a stream ofmolten metal 27. A bracket 28 supports the pipe 18 and provides thata'movement of the truck, and consequently oi the trough results inmovement of the plungers ,16 and 17. A iiexible conduit 29 connectedwith a source vof supply conveys a cooling medium to the pipe 18, fromwhence it is dispersed by the apertures 19 in the pipe 13. A valvepreferably a pressure re ulating valve, is located on the conduit 29, utis not shown in the drawings. The amount of cooling medium dispersed o nthe mold may be regulated by this valve.

In a casting operation the truck 22 is moved to the ,left until thespout 26 of the trough is at approximately 31. In this position theplunger '16 is adjacent the end of the chamber 13. Molten metal isdischarged from the ladle 21 into the trough and flows to the s out 26where it is poured into the mold. t the time the pouring is commenced,

a valve, not shown, on the feed line for thev cooling medium, is opened.The cooling mediuni flows through the conduit 29, the pipe 18, and thatportion of the chamber 13 be. tween the plungers 16 and 17 is filledwith the cooling medlum, and discharges the same upon the exterior ofthe mold. The spout is retained at 31- momentarily, for a greater amountof metal is required for the formation of the bell than is required inthe barrel of the pipe. When the bell has been formed, the. truck 22moves to the right. As it does, the plungers 16 and 17 are movedaccordingly. It will be observed that a sectionkofthe mold is cooledimmediately succeeding the point at which molten metal is beingdischarged from lthe spout., Only that portion of the chamber 13 betweenthe plungers co'ntains the cooling medium, and only that part of themold included within the area between the lungers is cooled.

T e degree of cooling may Abe'regulated by the valve, above referred to,for the amount and pressure of the cooling medium may'be varied.

In Figure, a crosssection'al view, there is shown the lateralarrangement of the apparatus. The particular shape of the standard 15may be varied. eye 32 is formed at itsvupper end for supporting thechamber 13. While I have shown only one chamber,

it is of course to be understood that a plurality may be provided. Theexact location of the chamber with respect to the mold may also bealtered, provided the cooling medium is dispersed upon the mold.

In Figure 3, a more detailed View of the plunger and chamber, theapertures 19in the pipe 18 are shownperpendicular tothe apertures 14 inthe chamber. It is not essential that the particular relationshipbetween the two sets of apertures be such as shown in the drawings, butthis is preferable inasmuch as it insures a more even flow of Huid fromthe apertures 14. 'Ihe pipe 18 is shown, by the dotted lines 33,extending within the plunger 17. The pipe 18 might terminate at theplunger 17 provided there are means for conducting the fluid to theinterior of that portion of the pipe 18 between the two plungers.

It will be seen from the foregoing that vthe cooling of the mold and thepoured metal is gradual. rIhe mold is not prematurely cooled and themetal is poured into a mold of normal temperature. The cooling'does notcommence until the metal has been poured in the mold and continues foronly a comparatively short time. The duration of the cooling, however,is suiicient to prevent any overheating of the mold. The cooling periodis of course dependent upon the speed at which the plungers 1G and 17slide in the chamber 13 and also upon the length of the pipe 18intermediate the two plungers. It is to be observed that the cooling iscontinuous for all that portion of the mold containing the most recentlypoured metal, but does not cool continuously all. of the mold in whichthe metal is deposited.

While I have shown the plungers in such a relation to the trough thatthe coolingcommences with the deposition of metal within the mold, undercertain circumstances this arrangement may be varied so that the coolingprecedes or follows the pouring of the metal.

In Fig. 5, for instance, there is shown a system in which the mold iscooled before the metal is deposited. The plunger 17 precedes thespoutin its movement the length of the trough, so that when the metal ispoured it is deposited on a portion that has een prematurely cooled. Theextent of this premature cooling can of course be regulated by varyingthe distance the plunger 17 precedes the spout.

There is depicef in Fig. 6, an arrangement whereby the cooling isdelayed for an intervaly after the metal is poured. The metal cools to acertain extent without the aid of arti- `icial means, but the cooling ishastened when my invention obviates, or at least minimizes, thenecessity for an annealing process. This results in a considerablesaving in the cost of manufacture and greatly reduces the time necessaryto secure a completed product.

In the specification and claims I have used such phrases as cooling aprogressi-ve section of the mold. These phrases refer to the cooling ofsuccessive partially overlapping sections, each section (though ofuniform length) varying very slightly in its co-extension with respectto the immediately preceding and succeeding sections. This results in asubstantially flow-likeadvance of the cooling along the mold. Incontra-distinction to the present system, reference is made toapplicants copending. application Serial No.

172,355, filed March 3, 1927,.in which there is an incremental coolingof the mold; and to applicants copending application Serial No. 17 7,652, filed March 23, 1927, in which there is no overlapping of thevarious sections, and which results in abrupt and distinct sta es v inthe advance of the cooling along the mo d.

While I have shown and described the preferred embodiment of myinvention, I wish it to be understood that I do not confine my self tothe precise details of construction herein set forth, by way ofillustration, as itis apparent that many chan es and variations may bemade therein, by t ose skilled in the art, without departing from thespirit of the invention, or exceeding the scope of the ap pended claims.

I claim:

1. A centrifugal casting apparatus comprising a mold, a cooling member,and means for limiting the cooling to a section of the mold, the sectionprogressing the length of the mold and lincludin that portion of themold where metal is eing poured.

2. In an apparatus for centrifugal casting, a cooling system for arotatable mold, comprising a fluid dispersing member and slid- 4ablymounted in the member plungers stationary with respect to each other.

3. In a cooling system for a rotary mold, a member adapted to disperse acooling medium on the mold, plungers slidably mounted in the coolingmember, and means for maintaining the plungers in spaced relation.

4:. In a centrifugal casting apparatus cooling system, a fluiddispersing member, and slidably mounted therein plungers maintained inspaced relationship by an apertured member.

5. A cooling system for a centrifugal casting apparatus comprising amember adapted to diseperse a cooling medium, slidable plungers lixedlyspaced with respect to each other vmounted in the member, means Jforactuating the plungers and supplying the member intermediate theplungers with a cooling medium, said means coacting with a trough forpouring metal in the mold.

6. A` centrifugal casting a paratus comrising a mold, a cooling mem erand means or limiting the cooling to a section of the mold, the'.section progressing the length ofthe mold.

In testimony whereof I affix my signature.

FRANK G. GARRINGTON."

